The journey of man

the journey of man a genetic odyssey review

Analysis of the Y chromosome is one of the methods used in tracing the history of early humans. And walk we did, to the farthest corners of the earth.

Human migration video national geographic

What happened to the descendants of other men who lived at the same time? Human Sapiens are the first primates to live in thus land. Synopsis[ edit ] According to the recent single-origin hypothesis , human ancestors originated in Africa, and eventually made their way out to the rest of the world. Even our brains started changing in shape and size after walking upright. Probably it was the acquisition of language and its associated symbolic perception of the world. Climate change was the main reason for our upright walk. More than The genetic trends reported involve humans who left Africa, and their genetic histories. There was another wave of migrants, though, coming up from Southeast Asia, that settled in the American southwest. Together with natural curiosity climatic change became the driver of expansion at this point. About , years ago the ice that covered much of the north American continent began to melt, and a passage opened, through which these tiny populations of Siberian hunters expanded south, reaching the tip of South America within 1, years. Thirteen genetic markers on the Y-chromosome differentiate populations of human beings.

They are the ancestors of Native Americansand years later, they had reached as far as South America. But within Africa, isolation would have been geographically aided primarily by the Sahara Desertleaving people in areas not separated by the desert to travel and migrate relatively freely.

Soon the thorough mixing of the genes, languages and cultures will erase the story of our past. There was another wave of migrants, though, coming up from Southeast Asia, that settled in the American southwest.

Thirteen genetic markers on the Y-chromosome differentiate populations of human beings. The fidelity of copying is exemplary, but errors, or mutations, do sometimes occur.

spencer wells

And by looking at lots of DNA they can tell which groups are ancestral, which are descendant, and, by plotting the results on a map, infer how our species has procreated itself through history and around the globe. Wells tells us that we can trace our origins back to a single Adam and Eve, but that Eve came first by some 80, years.

These are the only languages in the entire world that use these sounds in speech.

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The Journey of Man: A Genetic Odyssey by Spencer Wells